RT8005

Manufacturer Part NumberRT8005
Description1A, 2MHz, High-Efficiency Synchronous Buck PWM Converter
ManufacturerRICHTEK [Richtek Technology Corporation]
RT8005 datasheet
 


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1A, 2MHz, High-Efficiency Synchronous Buck PWM Converter
General Description
The RT8005 is a high-efficiency synchronous buck PWM
converter with integrated P-Channel and N-Channel power
MOSFET switches. Capable of delivering 1A output current
over a wide input voltage range of 2.4V to 5.5V, the RT8005
is ideally suited for portable applications powered by a
single Li-Ion battery or by 3-cell NiMH/NiCd batteries. The
device operates at 2MHz PWM switching fixed frequency,
can use smaller C
, C
capacitor and inductor.
IN
OUT
The RT8005 integrates two low R
of high- and low-side switching MOSFETs to reduce board
space, as only resistors and capacitors along with one
inductor are required externally for operation. The RT8005
has adjustable output range down to 0.5V. The other
features include internal soft-start, chip enable, over-
temperature and over-current protections. It is available in
a space-saving VDFN-10L 3x3 package.
Ordering Information
RT8005
Package Type
QV : VDFN-10L 3x3 (V-Type)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Note :
Richtek Pb-free and Green products are :
}RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
}Suitable for use in SnPb or Pb-free soldering processes.
}100% matte tin (Sn) plating.
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area, otherwise visit our website for detail.
DS8005-08 August 2007
Features
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230m and 180m
DS(ON)
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Applications
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Pin Configurations
2.4V to 5.5V Input Voltage Range
Adjustable Output from 0.5V to V
Guaranteed 1A Output Current
Accurate Reference : 0.5V (± 1.5%)
Up to 90% Conversion Efficiency
Typical Quiescent Current : 200 A
Integrated Low R
High- and Low-Side Power
DS(ON)
MOSFET Switches : 230m and 180m
Current Mode PWM Operation
Fixed Frequency : 2MHz
100% Maximum Duty Cycle for Lowest Dropout
Internal Soft-Start
No Schottky Diode Required
Over-Temperature and Over-Current Protection
Small 10-Lead VDFN 3x3 Package
RoHS Compliant and 100% Lead (Pb)-Free
Battery-Powered Equipments
Low Power CPU and DSP Supplies
Digital Cameras and Hard Disks
Protable Instruments and Notebook Computers
Celluar Phones, PDAs, and Handheld PCs
USB-Based DSL Modems and Other Network Interface
Cards
(TOP VIEW)
LX
1
10
PVDD
2
9
PVDD
GND
3
8
VDD
4
7
EN
11
9
5
VDFN-10L 3x3
RT8005
IN
PGND
PGND
GND
COMP
FB
www.richtek.com
1

RT8005 Summary of contents

  • Page 1

    ... The RT8005 is a high-efficiency synchronous buck PWM converter with integrated P-Channel and N-Channel power MOSFET switches. Capable of delivering 1A output current over a wide input voltage range of 2.4V to 5.5V, the RT8005 is ideally suited for portable applications powered by a single Li-Ion battery or by 3-cell NiMH/NiCd batteries. The ...

  • Page 2

    ... SR0403 Sumida CDRH3D16 GOTREND GTSD53 Suggested Capacitors For C Component Supplier TDK C1608X5R1A225M Panasonic ECJ1VB0J225M TAIYO YUDEN JMK107BJ225M www.richtek.com 2 VDD PVDD 2.2uF LX Chip Enable 5 EN RT8005 7 COMP FB C COMP PGND 10nF GND 8, Exposed Pad (11) (uF) C (uF) L (uH) OUT OUT 2.2 2.2/4.7 2.2 2.2 2.2/4.7 2.2 2.2 2.2/4.7 2.2 2.2 2 ...

  • Page 3

    ... PCB and connected to GND for maximum power dissipation. Power Ground. Connect this pin close to the terminal of C VDD Current Limit Slope Temperature Compensation Detector - PWM Comparator + + Error Amplifier - GND Pin Function and C IN Over Current Sense Detector Control Driver Logic Zero Detector RT8005 . OUT PVDD LX PGND www.richtek.com 3 ...

  • Page 4

    ... RT8005 Absolute Maximum Ratings Supply Voltage, PVDD and VDD l EN, FB Voltage --------------------------------------------------------------------------------------------------- 0. PGND to GND ---------------------------------------------------------------------------------------------------- 0. Voltage --------------------------------------------------------------------------------------------------------- 0. Power Dissipation VDFN-10L 3x3 ----------------------------------------------------------------------------------------------------1.923W Package Thermal Resistance (Note 4) l VDFN-10L 3x3, -----------------------------------------------------------------------------------------------52 C/W JA Junction Temperature -------------------------------------------------------------------------------------------150 C l Lead Temperature (Soldering, 10 sec.) ----------------------------------------------------------------------260 C ...

  • Page 5

    ... Note 4. is measured in the natural convection JEDEC 51-7 thermal measurement standard. DS8005-08 August 2007 Symbol Test Conditions V = 2.4V to 5.5V, Shutdown 2.4V to 5.5V, Enable high effective thermal conductivity test board of A RT8005 Min Typ Max Units -- -- 0 180 -- www.richtek.com ...

  • Page 6

    ... RT8005 Typical Operating Characteristics Line Regulation Deviation 0.4% 0 1.2V OUT 0.2% 0.2 0. -0.2% -0.2 -0.4% -0.4 -0.6% -0.6 2 2.5 3 3.5 Input Voltage (V) Current Limit vs. Input Voltage 2 1.2V OUT 2 1.8 1.6 1.4 1 2.5 3 3.5 Input Voltage (V) Frequency vs. Input Voltage 2.15 2.1 2.05 2 1.95 1.9 1.85 2.5 3 3.5 Input Voltage(V) www.richtek.com 50mA OUT I = 1000mA OUT = 500mA OUT 4 4.5 5 5.5 4 4.5 5 5.5 4 4.5 5 5.5 Load Regulation Devation ...

  • Page 7

    ... V = 3.3V 0.65V EN FB 210 200 190 180 170 160 150 -50 - Temperature (°C) V vs. Temperature REF 0.5 -50 - Temperature (°C) Soft Start Function 1.2V OUT OUT OUT Time (500 s/Div) RT8005 75 100 125 75 100 125 www.richtek.com 7 ...

  • Page 8

    ... RT8005 Steady State V = 3.3V 1.2V OUT V OUT (2mV/Div (1V/Div (500mA/Div) Time (100 s/Div) Load Transient Response V = 3.3V 1.2V IN OUT I = 100mA to 1A OUT Output Voltage Load Current Time (100 s/Div) www.richtek.com 8 = 0mA OUT (2mV/Div) (100mV/Div) (500mA/Div) Steady State V = 3.3V 1.2V OUT ...

  • Page 9

    ... PWM Operation During normal operation, the RT8005 regulates output voltage by switching at a constant frequency transferring the power to the load in each cycle by PWM. The RT8005 uses a slope-compensated, current-mode PWM controller capable of achieving 100% duty cycle. At each rising edge of the internal oscillator, the Control Logic cell sends a PWM ON signal to the Driver cell to turn on internal P- MOSFET ...

  • Page 10

    ... LX node to prevent stray capacitive noise pick-up. 4. Connect feedback network behind the output capacitors. Keep the loop area small. Place the feedback components near the RT8005. 5.Connect all analog grounds to a command node and then connect the command node to the power ground behind the output capacitors ...

  • Page 11

    ... V-Type 10L DFN 3x3 Package Richtek Technology Corporation Taipei Office (Marketing) 8F, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek.com RT8005 2 1 DETAIL A Pin #1 ID and Tie Bar Mark Options Dimensions In Inches Min Max 0 ...